Some of the instructions that come with Trail Cameras warn something to this effect: Make sure the camera is turned off before changing batteries or SD cards as the camera could be damaged.
I would try shutting off the camera, remove the batteries and SD card. Check with a digital meter to make sure the batteries are at full charge. New batteries fresh out of the package may have a low or faulty one. When anyone battery gets down to 1.0 to 1.2 volt the camera will not function properly or not at all. With the camera shut off, re-install the batteries and put in a new or fomatted SD card, making sure the card is unlocked. Now turn on the camera. If this fails to work, email the manufacture, explaining what has happened and see if they have a solution before sending the camera for repair or scrapping it. Good luck.